-15 + (-3)
A.
18
B.
-18
C.
12
D.
-12
C.
12
To calculate -15 + (-3), you simply add the two numbers together.
-15 + (-3) equals -18.
Therefore, the correct answer is option B - (-18).
To solve the expression -15 + (-3), we need to add the two numbers together.
First, we have -15. We know that a negative number is represented by a minus sign (-) in front of it, and it means we move in the opposite direction on the number line.
Next, we have -3. Similarly, the minus sign (-) indicates a negative number.
To add these two negative numbers, we add their absolute values (ignoring the minus signs) and then attach a minus sign to the sum.
The absolute value of -15 is 15, and the absolute value of -3 is 3.
So, 15 + 3 equals 18.
Since both original numbers were negative, we attach a minus sign to the sum.
Therefore, the correct answer is B. -18.